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SBAS366–OCTOBER 2006
Data
a) 20 Bits of Data Retrieval
Data Ready
New Data Ready
MSB
19
LSB
0
DRDY/DOUT
18
17
tPD
tHT
tDS
tSCLK
tUPDATE
1
20
SCLK
tSCLK
tCONV
Data
b) 24 Bits of Data Retrieval
Data Ready
New Data Ready
MSB
19
LSB
0
3
DRDY/DOUT
18
17
1
2
4
tPD
tHT
tDS
tSCLK
tUPDATE
1
20
21
22
23
24
SCLK
tSCLK
tCONV
Figure 25. Data Retrieval Timing
SYMBOL
tDS
DESCRIPTION
MIN
TYP
MAX
UNITS
ns
DRDY/DOUT low to first SCLK rising edge
SCLK positive or negative pulse width
0
tSCLK
tPD
100
ns
SCLK rising edge to new data bit valid: propagation delay
SCLK rising edge to old data bit valid: hold time
Data updating: no readback allowed
50
ns
tHT
0
ns
(1)
tUPDATE
39
µs
SPEED = 1
Conversion time (1/data rate)
SPEED = 0
12.5
100
ms
ms
(1)
tCONV
(1) Value given for fCLK = 4.9152MHz. For different fCLK frequencies, scale proportional to CLK period.
Data
Data Ready
New Data Ready
DRDY/DOUT
SCLK
19
18
17
0
1
20
21
21st SCLK to Force DRDY/DOUT High
Figure 26. Data Retrieval with DRDY/DOUT Forced High Afterwards
15
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